长期定位施肥对无石灰性潮土钾素演变的影响.pdf

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1、●CT_8仰iaREI叫OU．LTsU洲R％AE华北农学报·2014，29(2)：199．203长期定位施肥对无石灰性潮土钾素演变的影响温立玉，宋祥云，刘树堂，王飞，宋增强(青岛农业大学资源与环境学院，山东青岛266109)摘要：为了探讨不同施肥对土壤钾素的变化规律，基于连续进行36年的长期定位试验，研究了长期定位单施氮肥和有机肥配施氮肥对无石灰性潮土全钾及不同形态钾的含量影响。结果表明：连续单施高量氮肥与对照相比水溶性钾降低了0．09mg／kg，交换性钾降低了16．34mg／kg，速效钾降低了3．61mg／kg，缓效钾降低了12．3mg／kg，全钾降低了2

2、．1g／kg。而长期高量有机肥配施低量氮肥与对照相比，水溶性钾增加了1．28mg／kg，高量有机肥配施高量氮肥与对照相比，交换性钾增加了27．22mg／kg；而单施有机肥、有机肥配施氮肥土壤速效钾、缓效钾和全钾的含量均呈增加趋势。土壤速效钾与有机质和阳离子代换量显著相关。这表明长期单施氮肥不利于土壤各形态钾素及全钾的积累，单施有机肥或有机肥配施氮肥有利于提高无石灰性潮土中各形态及全钾的含量。关键词：长期定位施肥；无石灰性潮土；钾素演变；钾素形态中图分类号：S147．3文献标识码：A文章编号：1000—7091(2014)02—0199—05EfectofLo

3、ng-termFertilizationonDynamicsofPotassiuminNon·-calcareousFluro--aquicSoilWENLi—yu，SONGXiang—yun，LIUShu—tang，WANGFei，SONGZeng—qiang(CollegeofResourcesandEnvironment，QingdaoAgriculturalUniversity，Qingdao266109，China)Abstract：Inordertoinvestigatethevariationofdifferentfertilizationon

4、soilpotassium，theeffectoflong—termfertilizationofnitrogen(N)organicmanure(M)ormanurewithnitrogen(MN)ontheamountsoftotalpotassiumanddiferentformsofpotassiuminnon—calcareousfluro—aquicsoilwasstudiedbasedon36yearsoflong—termexperiment．Theresultsshowedthattheamountsofpotassiumdecreased

5、withlong-termfertilizationofhighrateofnitrogen(N2)fertiliz-er，comparedtocontroltreatment(CK)thewatersolublepotassium，exchangeablepotassium，availablepotassium，non-exchangeablepotassiumandtotalpotassiumweredecreasedfor0．09mg／kg，16．34mg／kg，3．61mg／kg，12．3mg／kg，2．1kg，respectively．Compar

6、edtocontroltreatment(CK)，theincreaseinwatersolublepotassiumWas1．28mg／kgandex-changeablepotassiumwas27．22mg／kgforhighrateoforganicmanure(M2)withlowandhighrateofnitrogen(NlorN2)．However，theavailablepotassium，non—exchangeablepotassiumandtotalpotassiumRendedtoincreasewithcontinuefertil

7、ization．TheavailablepotassiumWascorrelatedtosoilorganicmatter(SOM)andcationexchangecapacity(CEC)．ItsuggeststhattheMorMNfertilizerisgoodforincreasingdifferentformsofpotassiumandtotalpotassiuminnon—calcareousfluro—aquicsoil，butnotthefertilizationofsingleNfertilizer．Keywords：Longtermf

8、ertilization；Non-calcareou